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Old 08-18-2012, 2:28 PM
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Default Accessory Mic for CDM 1550

Hi all just recieved a new E-One fire engine and we are going to mount 3 CDM 1550's in an overhead console. We would prefer to not have mic wires hanging so looking to mount the Mic's down low. I understand i can plug into the 20 pin acc. plug on rear of radio. I have the pin kit from motorola and i believe i need a RJ45 plug? can anyone help with this wiring. What are the pin outs and what should i use for a plug on the other end? phone jack?. and what will need to be changed in the RSS programming? thank you in advance!
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Old 08-18-2012, 5:08 PM
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Batwing Laboratories

Everything you need is on the 20 pin connector. You will need to set it up to use the external mic. If I recall correctly there is a "default" that sets it correctly. If not, one of us could look it up for you.
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Old 08-19-2012, 4:44 PM
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do you know what pins will be used, and what i need for a remote jack?
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Old 08-19-2012, 5:04 PM
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I'll have to look on Monday when I get back to work for the exact set up in CPS. You will need to assign pins for push to talk, and that is done in CPS.

The Batlabs page for CDM1550 shows the pin out for the 20 pin connector on the back of the radio.
Pin 2 is external mic audio
Pin 7 is ground
You will need to assign a pin for the Push To talk.

On an RJ45 plug, the following pins would be used to connect the mic:
Pin 4 Ground
Pin 5 Mic audio
Pin 6 Push to talk
Pin 3 Hook

So, you would need to make a cable that does the following:
Pin 5 on the RJ45 would go to pin 2 on the 20 pin connector for Mic auto
Pin 4 on the RJ45 would go to pin 7 on the 20 pin connector for Ground
Pin 6 on the RJ45 would go to pin 3, depending on programming for PTT
Pin 3 on the RJ45 would go to pin x, depending on programming for the hook (HUB/hang up box)
(might be good to have someone double check this, as I've never personally done it on a CDM, but I have done it on a number of Kenwoods.
Ideally you would want some shielded cable for the mic audio, but you might be able to get away with a short run of Category 3 or 5 cable, or pretty much any multi conductor cable, for a short run.

I'll have to look at the CPS when I get to work tomorrow. I've got a MAC laptop I take home, and all my CPS/RSS is on a PC back at the shop.
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Old 08-19-2012, 5:06 PM
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Oh, this might help:

Mic Plug wiring, same as a Maxtrac:
http://www.batlabs.com/images/maxrad.gif

20 pin connector wiring:
HT750/1250/1550/PRO5150/7150/9150/GP320/340/360/380/ GP318/338/GP640/680/1280/CDM750/CDM1250/CDM1550,etc. (a little more than half way down the page)
20 pin connector pin numbers:
http://www.batlabs.com/images/cdmacc.gif

You can use the 16 pin connectors to do this as pins 17, 18, 19, and 20 are on the outside edges, and you won't need those pins for what you are doing.
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Old 08-20-2012, 4:36 PM
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So, using Professional Radio CPS R06.11.10:

There are two ways to do this:
One would be to select the "accessory package" as "Remote"

Or, you can do it manually:
Go to "radio configuration.
Click on "Accessory Pins" tab.
For pin 6, select External Mic PTT (Input)


For pin 3, select Mic Off Hook (input)

That should do it. You may have to play around to get it to work correctly. Maybe someone who is more familiar could give you a hand. Like I said, I've never done this on a CDM, only on a few Kenwood radios.

Good luck
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Old 08-21-2012, 2:16 PM
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awesome thank you!
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Old 08-21-2012, 4:23 PM
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Be aware that the "accessory package" setting will use different pins than the example I used. It will show you on the screen which pins are used for what.
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Old 08-21-2012, 4:34 PM
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In My humble opinion.....if you spent that kinda money on a New Fire truck.....cant the radio installer do all this for you? I would have specked it from the start... If you want practice i suggest your own radios... IMHO
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Old 08-21-2012, 6:40 PM
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I have done this on my own radios, but they are xtls. We have a dept radio tech who only programs will not install. Not a big issue to extend a microphone, just questioning if anything in cps needed to be changed. I'm new to motorolas.
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